13. Gordon? I think he   (write) a letter at the moment.

14. It’s the first time  (I/ever/eat) octopus!

15. I really  (play) his guitar at half past seven.

17.The shopping centre was  (build)  about 20 years ago.  

18. I can’t resist  (buy) things when they’re in the sales.

19. The Pacific is the  (deep) ocean in the world.

20. Not only   (Jerry/forget) my birthday, but he also forgot our wedding anniversary.